STANFORD -- She doesn't run the fastest. She doesn't hit the hardest. She doesn't have a monster serve.

But there's a reason Agnieszka Radwanska has 12 Women's Tennis Association titles at 24 and is ranked No. 4 in the world. She just rarely makes as many mistakes as her opponents do.

Radwanska, a deft and deliberate counter-puncher, was close to her defensive best Saturday night as she dismantled Jamie Hampton 6-3, 6-2 in the Bank of the West Classic semifinals at Taube Family Tennis Center.

Actually, Radwanska pretty much let Hampton dismantle herself simply by making far fewer errors than the 23-year-old American, who boasts a promising power game and an aggressive mind-set but was far too erratic to offer a strong challenge to the tournament's top seed in this match.

The unforced error count said it all: Hampton 35, Radwanska 7. And for good measure, Hampton had six double faults to zero for the Polish star.

"I had a solid start, but then lost it pretty badly," said Hampton. "(Radwanska) makes you feel you have to do something on every shot because she's not going to give you many errors. Then once you start thinking about it too much, errors start creeping in."

Radwanska will meet No. 3 seed Dominika Cibulkova of Slovakia in Sunday's championship match after Cibulkova beat Sorana Cirstea 6-4, 6-0 in the other semifinal.

As expected, Hampton came out slamming it hard, and she briefly looked ready to go after her first WTA final on U.S. soil when she rallied from 0-40 to break Radwanska in the first game of the match. But she gave it right back on her own serve, double-faulting twice.

Hampton broke Radwanska a second time in the fifth game for a 3-2 lead but once again couldn't take advantage. She hit long on what should have been a routine put-away and then hit long on a rally.

From there, Radwanska's baseline game got increasingly sharp while Hampton just got sloppier. Radwanska wasn't broken again the rest of the match as she ran Hampton all over the court and won in just 71 minutes.

Her victory sets up an intriguing final against Cibulkova, a player similar in style to Radwanska. At least tennis fans better hope it's more intriguing than the last time they met in the final of the Apia International in Sydney, Australia, in January. Radwanska scored a 6-0, 6-0 victory that improved her record against Cibulkova to 3-0.

After dispatching Cirstea, the fifth seed from Romania, Cibulkova reflected on that early season disaster against her Sunday opponent. It wasn't as bad as the score indicated, she maintained.

"If you would see that match, you would not believe it, because I applied pressure all the time, and in the first set, I had break point or game point in almost every game but just couldn't make the big shot," she said.

Cibulkova staged her own impressive display of defensive tennis Saturday and simply wore down Cirstea. How defensive? She didn't have an ace in the match, and actually won a greater percentage of points on her second serve than her first.

Follow Carl Steward on Twitter at twitter.com/stewardsfolly.